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Effects of antibody affinity and antigen valence on molecular forms of immune complexes.

Abstract：

:The effect of antibody affinity on molecular forms of immune complexes was investigated by measuring antigen-antibody interactions using surface plasmon resonance (SPR), electrospray ionization time-of-flight mass spectrometry under non-denaturing conditions (MS), analytical ultracentrifugation (AUC), and transmission electron microscopy (TEM). (4-Hydroxy-3-nitrophenyl)acetic acid (NP) of different valences was conjugated to bovine serum albumin (BSA) and these conjugates were used as antigens. In the interaction between N1G9, a low affinity antibody, and NP(7)-BSA, a 1:1 immune complex was detected as the major product and higher molecular weight complexes were not obtained by any of the methods employed. These results suggested that N1G9 predominantly formed an intramolecular divalent complex with NP(7)-BSA using the two Fab arms of an antibody. Although complexes of various sizes were detected by MS, AUC, and TEM in the interaction between C6, a high affinity antibody, and NP(7)-BSA, only 1:1 immune complexes were observed by SPR. These results showed that two NP(7)-BSA molecules cannot simultaneously bind to an antibody, irrespective of antibody affinity strength, when the Fc region is immobilized to a flexible dextran matrix on sensor chip but are able to do so with high affinity antibodies free in solution. The results also showed that the stoichiometry of the antigen-antibody interaction is altered by restricting the movement of the Fc region. Since immunoglobulins exist as antibodies in solution or as B cell receptors on the cell surface, it is suggested that interactions of B cell receptors with polyvalent antigens such as NP-BSA might be different from those of antibodies free in solution.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Oda M,Uchiyama S,Noda M,Nishi Y,Koga M,Mayanagi K,Robinson CV,Fukui K,Kobayashi Y,Morikawa K,Azuma T

doi

10.1016/j.molimm.2009.09.009

subject

Has Abstract

pub_date

2009-12-01 00:00:00

pages

357-64

issue

2-3

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(09)00711-1

journal_volume

47

pub_type

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